Acknowledgements
The author thanks the Chairman, Department of Geology, AMU, Aligarh for providing necessary facilities. Dr. V. Balaram, NGRI, Hyderabad and Dr. N. K. Saini, WIHG, Dehradun are thankfully acknowledged for the geochemical analyses. I am also thankful to the DST, New Delhi for sanctioning me the project under the HIMPROBE programme.The author is also thankful to Drs. Rafiqul Islam and D.V. Subba Rao for their constructive reviews.